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UBSAN: array-index-out-of-bounds in fs/jfs/jfs_xtree.c:622:15
index 19 is out of range for type 'xad_t [18]'
CPU: 1 PID: 17049 Comm: syz-executor.4 Not tainted 6.6.0-rc1-syzkaller-00115-g9fdfb15a3dbf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_out_of_bounds+0x111/0x150 lib/ubsan.c:348
 xtInsert+0xe82/0xef0 fs/jfs/jfs_xtree.c:622
 extAlloc+0x834/0xf00 fs/jfs/jfs_extent.c:145
 jfs_get_block+0x428/0xb20 fs/jfs/inode.c:248
 __block_write_begin_int+0x3c0/0x1470 fs/buffer.c:2107
 __block_write_begin fs/buffer.c:2157 [inline]
 block_write_begin+0xb1/0x490 fs/buffer.c:2216
 jfs_write_begin+0x31/0xd0 fs/jfs/inode.c:299
 generic_perform_write+0x278/0x600 mm/filemap.c:3942
 __generic_file_write_iter+0x1f9/0x240 mm/filemap.c:4037
 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4063
 __kernel_write_iter+0x261/0x7e0 fs/read_write.c:517
 dump_emit_page fs/coredump.c:888 [inline]
 dump_user_range+0x299/0x790 fs/coredump.c:915
 elf_core_dump+0x2721/0x38e0 fs/binfmt_elf.c:2142
 do_coredump+0x2c96/0x3fc0 fs/coredump.c:764
 get_signal+0x244b/0x27b0 kernel/signal.c:2878
 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:309
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0xc7425cb6ee
Code: Unable to access opcode bytes at 0xc7425cb6c4.
RSP: 002b:0000000020000418 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007efc3b19bf80 RCX: 00007efc3b07cae9
RDX: 0000000020000240 RSI: 0000000020000410 RDI: 0000000020000000
RBP: 00007efc3b0c847a R08: 0000000020000440 R09: 0000000020000440
R10: 00000000200002c0 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007efc3b19bf80 R15: 00007fffbf79ce28
 </TASK>
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